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IMPROVEMENT IN COMBINED BULB AND SQUARE.

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TO ALL WHOM IT MAY CONOERN:

Be it known that I, W. O. JONES, of' Portland, in Vthe county of Cumberland, and State of' Maine, have invented a new and useful Combined Square and Rule; and I hereby declare the following to be 'a full, clear,

and exact description thereof, which will enable others to make and use my invention, reference being had to the accompanying drawings, forming part of this'spccificntion, in whicl Figure 1 shows a side view of o rule, illustrating the extent to which the two arms can be opened.

Figure 2, two opposite edge views of a portion of a rule with my invention constructed thereon.

Figure 3, a side view of a portion of a rule, showing the graduated scale, and illustrating the nature ot' my improvement. l

Figure 4, a. side view of n portion of a rule embodying my improvement, and so placed as to show the nnture and purpose of my invention.

The object' of my invention is, by making certain changes in an ordinary rule, such as closesup from the centre by means of n, hinge, to enable it to be used for a square or a bevcl.

The form of construction an ordinary hinge-rule is well known, consisting of two arms united by the hinge, so that one arm cnn-be swungl around upon the hinge until the two inner edges ot' the arms come in conta-ct, vand these arms can beswung apart until they form a single straight rule, as illustratedin iig. 1.

My invention enables the arm A to be turned still further backward from the position shown inrfig. 1, till it is placed in the position shown in fig. 4, and thus form a square, and, of course, to any point intermediate, as in iig. 3.

In the ordinary rule, when the two parts are opened so as to form a straight line, two shoulders on the outer side of the arm come'in contact with each other, and prevent the arms being further opened, as at a, fig. 1. In my invention, the joint or hinge is made as follows: The shoulder upon the part I1 is left as usual, (see c, iig. Between thebrass pieces from which the joint is made a space is left, (see d.) Into this space ,the

end othe other arm is so made as to lslide and enter, when the two parts are placed as se'en in fig. 4. When thus placed, the part, 1, ofthe arm A rests against the `shoulder-f on the part B, thus forming the square.

The angle of inclination of the arm A, when this angle is more than a right angle, is indicated by the graduated scale-. y

lWhat I claim as my inventiomand desire to secure by Letters Patent, is- Making the joint in the manner described, so that,the rule can be used as a square, and this in combination with the graduated scale, so that it can be used as a bevel. i

W. '0. JONES.

Witnesses:

WILLIAM HENRY CLIFFORD,v HENRY C. HOUSTON. 

